Survival rate and growth of larvae and early juveniles in the swimming crab, Portunus trituberculatus (Miers) reared in the laboratory

Abstract

Swimming crabs, Portunus trituberculatus(Miers) are commercially important off the coasts of Korea, Japan and China. Harvest of swimming crabs has been fluctuated along their distribution ranges. Fluctuations in the interannual harvest of swimming crabs may be correlated with the survival rate during the larval period.The survival rates, intermolt periods, and growth of larval swimming crabs were investigated in the laboratory. Larval swimming crabs are released and undergo development from April to August off the western coast of Korea in the Yellow Sea. Sea surface temperatures off the western coast of Korea during the larval season were used for the laboratory experiments, and ranged from 22 to 26 C. Larvae were individually cultured at four different temperatures, 22 C, 24 C, 26 C, and 28 C. Zoea molted to megalopa at all temperatures and developed to the first crab stage at 24 C, 26 C, and 28 C. Survival rates from zoea I to the first crab stage increased with increasing temperatures. Intermolt period and the growth rate of the mean carapace length were inversely correlated with temperature. Our research helps understand the changes in survival rate and growth of larval swimming crabs resulting from changing oceanic temperatures. Further, our study suggests that the fluctuations in fishery harvest of swimming crabs off the coast of Korea may be related to changes in larval survival affected by changing ocean conditions.

Distribution and Occurrence of Swimming Crab, Portunus trituberculatus Larvae in the Mid-western Coast of Korea in the Yellow Sea

“…소에 대한 독성연구 꽃게의 종묘생 (Kang, 1997), 산과 유생 및 치하의 성장연구 (Pyeon, 1970;Seo 꽃게의 생존과 섭 et al, 2009;Ma et al, 2009), 이활동 및 자원생물학적 연구 (Kang et al, 1995; 그리고 꽃게의 유전학적 연구 An et al, 2012). (Kim et al, 1989;Yeon et al, 2010;Yoon, 2006) 등이 수행되어왔다 하지만 서해안이 꽃게의 주 .…”

Effects of Culture Conditions on the Survival and Growth of Larvae and Young Swimming Crabs Portunus trituberculatus (Miers)

“…. 먹이의 경우 양과 질에 따라서 직접적으로 유생의 성장에 영향을 미치며 (Suprayudi et al, 2002), 수온은 대사작용에 영향을 미쳐 성장에 큰 차이를 보이게 하고 있으며 (Kim and Hong, 2004;Ma et al, 2009), 염분의 경우 주로 수온과 복합작용으로 성장 및 생존에 영향을 미치는 것으로 알려져 있다 (Weinberg, 1982;Nagaraj, 1992 (Oshima, 1938), 그 후 종묘방류효과 (Oda and Bamba, 1982;Oda and Kamaki, 1988 (Pyen, 1970;Rho and Park, 1976;Ma et al, 2009 수 있다 (Minagawa, 1992 (Matsui et al, 1986). Callinectes similis와 C. sapidus의 위 속에 서는 저서성 무척추동물인 패류, 복족류 및 게류가 대부분이었 다 (Hsueh et al, 1992 (Sulkin, 1978), 본 종의 경우에는 zoea 3기에 artemia nauplii를 공급함으로서 공식을 방지 할 수 있다 (Takeuchi et al, 1999 (Newcombe, 1945;Cargo, 1958 (Marcus, 1980;McQueen and Steel, 1980;Nelson et al, 1983…”